#vehicle_fleet__vehiclefleet__fleet  group of motor vehicles operating together under the same ownership
  supertype:  #aggregation__collection__accumulation__assemblage  several things grouped together
  subtype:  #motor_pool  a fleet of military vehicles controlled by a single agency and available for use as needed
  member:  #taxi  #autobus
  part of:  #bus_line__busline  an organization responsible for operating a bus transportation system

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